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London's crucial questions answered

"If you heard or saw anything at the address that seemed out of place or of concern between the hours of 10.30pm on Thursday, 3 January, and 8.00am the following day, please don't hesitate to contact us."

Detectives from the Met's Homicide and Major Crime Command are investigating. Nobody else is sought in connection with their deaths.

Anyone with information should call the HMCC Incident Room on 020 8345 3865 or Crimestoppers anonymously on 0800 555 111.